/Engine/Source/Editor/UnrealEd/Public/DragAndDrop/AssetDragDropOp.h
class FAssetDragDropOp : public [FDecoratedDragDropOp](API\Editor\UnrealEd\DragAndDrop\FDecoratedDragDropOp)
TSharedPtr<FAs...
AssetThumbnail
Handle to the thumbnail resource
int32
ThumbnailSize
The size of the thumbnail